brewster



V2 Sheets-Sheet 2.

F. H. BREWSTER.

(No Model.)

ROLLER MILL.

No. 422,908. Patented Mar. 1l, 1890.

6MM/Mmmm.

UNITED STATES PATENT OFFICE.

FRANK H. BRE/VSTER, OF ESOANABA, MICHIGAN, ASSIGNOR TO THE COOH- RANE ROLLER MILLS COMPANY, OF SAME PLACE.

ROLLER-MILL SPECIFICTION forming' part Of Letters Patent N0. 422,908, dated March 11, 1890.

Application filed December 5, 1889. Serial No. 332,624- (No model.)

To all whom, it may concern: end of the roll for tramming and setting the Be it known that I, FRANK H. BREWSTER, rolls parallel, While the boxes of the movable of Escanaba, in the county of Delta and State roll are independently controlled by adjustof Michigan, have invented certain new and ing mechanism connected to the levers D'. 55 5 useful Improvements-in Roller-Mills3and Ido In effecting the adjustment of the rolls hereby declare the following to be a full, and at times during the operationof the mill clear, and exact description of the same, refone of the bearings O will or may be forced erence being hadrto the accompanying drawslightly in advance.u of the other or out of ings, forming apart of this specification, and line, thereby causing the roll to bind in its 6o 1c to the figures and letters of reference marked bearings or canting the levers laterally so thereon. that they Will. bind upon their fulcrum-pins. This invention relates to a new and im- To obviate this difficulty, the fulcrum-pins l proved construction and arrangement of adare formed With their surfaces curved in the justing and spreading mechanism for applidirection of the length of the pins and com- 65 15 cation to the movable rolls of roller-mills, debined With bearings 2l, Whose surfaces arein signed more particularly to facilitate the adparallel planes or larger arcs, so that the lejustment of the rolls for grinding and the vers will be free to vibrate laterally upon spreading` or separating of the rolls in starttheir fulcrum-pins Without cramping, and at `ing or stopping the mill. the same time IWill permit the levers to vi- 7o zo The said invention consists in the several brate in the direction required for causing novel combinations and arrangements of the approach or separation of the rolls. parts hereinafter described, and set forth in Each lever D is provided with an adjustthe claims. ing-screw 2, pivotally connected thereto so as In the drawings, Figure l is a top plan to accommodate itself to the angular position 75 t' 2 5 View, and Fig. 2 an end View, partly in secof the lever. Such aconnection may be formed tion, representing a portion of amill with the by providing the lever With a slot 3 for the improvements applied. Fig. 3 is a detail reception of the end of the screw and a crossview, partly in section, of the retracting depin 4, having its surface curved in the direcvices'applied to one of the lever-bearings. tion of its length and engaging the Walls of 8o 3o Fig. 4. is a plan View, and Fig. 5 a sectional a recess in the screw. The screw 2 is passed view, of a slightly-modified form of retractthrough a fixed portion of the frame-such as ing mechanism. Fig. 6 is a detail illustratthe top plate A-and is furnished With an ading the fulcrum of the lever-bearing. Fig. 7 justable collar or nut 5, between which latter illustrates a modification of the devices for and the frame is interposed a tension-spring 85 3 5 actuating the spreading-Wedges. 6, preferably surrounding the screw and held Similar lett-ers of reference in the several in place thereby. The upper or outer ends figures indicate the same parts. of the screw Q is `furnished With an adjust- The frame A of the mill may be of any deable stop--such as a nut 7-Which, by engagesired or approved construction, adapted to rement with a fixed abutment, limits the move- 9o 4o ceive and support the boXesBof whatis herein ment of the screw as effected by the spring designated as the lixed roll in contradistincand determines the position of the movable tion to the other or companion roll mounted in roll. movable bearings connected to the adjusting Between the frame or support and the adandspreadingdevicesandhereinafterreferred justable stop on the screw is interposed the 95 45 to as the movable roll. The movable roll active element or elements of the spreading is supported at its ends in boxes C, each conmechanism, the same comprising one or more nected to or mounted upon a separate lever Wedges arranged to reciprocate in or between D, fulcrumed upon the frame. suitable guides lO.

The boxes B of. the fixed roll are formed or In order that the adjustable collar 7 may roo 5o provided with suitable devices for eecting not be disturbed by the movement of the vertical and horizontal adjustments of each Wedge and the adjustment of the movable i i i.

roll be changed thereby, a block or collar 11, fitting loosely upon the screw and held from rotation by the guides 10 or equivalent means, is interposed between the said collar and the wedge.

As before remarked, one or more wedges may be employed for each adjusting-screw, although I prefer to make use of two wedges 12, riding the one upon the other, as shown in Figs. 2 and 3, rather than a single wedge 13, as shown in Figs. @L and 5.

A wedge-double or single-is applied to each lever-bearing D, and the two are connected by suitable mechanism for effecting the simultaneous movement of both, so that the opposite ends of the movable roll will be actuated at the same time.

The preferred mode of connecting the wedges for simultaneous action is shown in Figs. 1 and 4, the former as applied to the duplex Wedge and the latter to the single wedge. Thus in Fig. 4t the wedges 13 are connected by links 14 to a lever 15, fulcrumed between them, and in Fig. 1 the same arrangement is preserved, with this addition, that the two Wedges 12 of each pair are connected by links to opposite sides of the pivot of the lever, so that as the latter is oscillated the wedges will be moved in relatively opposite directions.

Other equivalent actuating devices maybe employed in lieu of the lever and links, of which one example is illustrated in Fig. 7, wherein screws are substituted.

The lever 15 may be oscillated about its axis to effect the reciprocation of the wedges by suitable means-such as a handle IG-and when two or more mills are arranged in line the levers 16 may be connected by a rod 17, whereby all of the movable rolls in the series may be retracted simultaneously.

In lieu of the hand-levers 16 for actuating the wedges, they may be operated from a rotating shaft connected through proper gearing with the lever 15, controlling the wedges,

and an arrangement of this kind is illustrated by dotted lines in Fig. 1, wherein 13 designates a segment secured to lever 15 and engaged by a worm 19 on a shaft 20, the latter extending the full length of the mill an'd being similarly connected to each of the spreading mechanisms in the series of pairs of rolls.

The wedges 12 13 are each formed with a central slot or opening to accommodate the screws.

Having thus described my invention, whatl claim as new is 1. In aroller-mill, and in combination with levers are mounted, substantially as de` scribed.

3. In a roller-mill, the combination of the two lever-bearings for the movable roll, the screws pivot-ally connected to said lever-bearings and protruded through a fixed portion of the frame, the limiting-collars applied to said screws, the wedges supported to reciprocate in guides laterally of the screws and between the collars and the fixed port-ion of the frame, an actuating-lever, and links connecting said lever to the wedges at opposite ends of the roll, substantially asdescribed.

4. In a roller-mill, and in combination with the bearings of the movable roll, and the adjusting and tension devices applied thereto,

, a double Wedge interposed between a collar or abutment on each adjusting device, and a xed support, a lever, and links connecting I the members ot' the double Wedge on opposite sides of the pivot of said lever, substantransversely of the screws and resting upon a fixed portion of the frame, and non-rotating su-pports interposed between the wedges and the limiting-collars on the screws to receive the thrust of the wedges and transmit motion to the screws, substantially as described.

6. In a roller-mill, the combination, with the independent lever-bearings for the movable rows, the screws flexibly connected to said lever-bearings, and the adjustable collars applied to said screws, of the sliding wedges connected to be moved in unison and mounted in guides on the frame between the lever-bearings and the adjustable collars, and a support or block guided to reciprocate with the screw and held from rotation, said block or support being interposed between the wedge and adjustable collar on the screw, substantially as described.

FRANK H. BREVVSTER.

Witnesses:

W. J. ELLIS, R. K. BREwsTnR.

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